0 votes 0 votes Let $M^4$= $I$,(where $I$ denotes the identity matrix) and $ M \neq I$, $M^2\neq I$ and $M^3\neq I$. Then,for any natural number $k$, $M^{-1}$ equals: $M^{4k+1}$ $M^{4k+2}$ $M^{4k+3}$ $M^{4k}$ Linear Algebra gate2016-ec-1 linear-algebra matrices + – Milicevic3306 asked Mar 27, 2018 retagged Mar 1, 2021 by Lakshman Bhaiya Milicevic3306 16.0k points 133 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.